diff --git a/extensions/fablabchemnitz_box4p.py b/extensions/fablabchemnitz_box4p.py
index 40d3cd12..e47d28bb 100644
--- a/extensions/fablabchemnitz_box4p.py
+++ b/extensions/fablabchemnitz_box4p.py
@@ -1,5 +1,4 @@
-#! /usr/bin/env python
-# coding=utf-8
+#! /usr/bin/env python3
 #
 # Este script dibuja el perfil exterior de corte la caja en un solo 
 # path cerrado y añade despues los otros flejes necesarios con colores
diff --git a/extensions/fablabchemnitz_can_generator.py b/extensions/fablabchemnitz_can_generator.py
index 3855c95f..73cc5ca3 100644
--- a/extensions/fablabchemnitz_can_generator.py
+++ b/extensions/fablabchemnitz_can_generator.py
@@ -1,5 +1,4 @@
-#! /usr/bin/env python
-# -*- coding: utf-8 -*-
+#! /usr/bin/env python3
 '''
 @author: mini@revollo.de
 member of the erfindergarden
diff --git a/extensions/fablabchemnitz_clonesperspective.inx b/extensions/fablabchemnitz_clonesperspective.inx
index 169609b2..d26c525a 100644
--- a/extensions/fablabchemnitz_clonesperspective.inx
+++ b/extensions/fablabchemnitz_clonesperspective.inx
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
   <name>Clones In Perspective</name>
-  <id>org.ekips.filter.clonesPerspective</id>
+  <id>fablabchemnitz.de.clonesperspective</id>
   <param max="256" name="num" type="int" gui-text="How many?">5</param>
   <param max="1.0" name="ratio" type="float" gui-text="relative size">0.9</param>
   <effect>
diff --git a/extensions/fablabchemnitz_contour_scanner.py b/extensions/fablabchemnitz_contour_scanner.py
index f0080116..da2fa449 100644
--- a/extensions/fablabchemnitz_contour_scanner.py
+++ b/extensions/fablabchemnitz_contour_scanner.py
@@ -57,13 +57,13 @@ class ContourScanner(inkex.Effect):
         self.arg_parser.add_argument("--removefillsetstroke", type=inkex.Boolean, default=False, help="Remove fill and define stroke")
         self.arg_parser.add_argument("--strokewidth", type=float, default=1.0, help="Stroke width (px)")
         self.arg_parser.add_argument("--highlight_opened", type=inkex.Boolean, default=True, help="Highlight opened contours")
-        self.arg_parser.add_argument("--color_opened", type=Color, default='#FF0000FF', help="Color opened contours")
+        self.arg_parser.add_argument("--color_opened", type=Color, default='4012452351', help="Color opened contours")
         self.arg_parser.add_argument("--highlight_closed", type=inkex.Boolean, default=True, help="Highlight closed contours")
-        self.arg_parser.add_argument("--color_closed", type=Color, default='#00FF00FF', help="Color closed contours")
+        self.arg_parser.add_argument("--color_closed", type=Color, default='2330080511', help="Color closed contours")
         self.arg_parser.add_argument("--highlight_selfintersecting", type=inkex.Boolean, default=True, help="Highlight self-intersecting contours")
         self.arg_parser.add_argument("--highlight_intersectionpoints", type=inkex.Boolean, default=True, help="Highlight self-intersecting points")
-        self.arg_parser.add_argument("--color_selfintersecting", type=Color, default='#0000FFFF', help="Color closed contours")
-        self.arg_parser.add_argument("--color_intersectionpoints", type=Color, default='#0066FFFF', help="Color closed contours")
+        self.arg_parser.add_argument("--color_selfintersecting", type=Color, default='1923076095', help="Color closed contours")
+        self.arg_parser.add_argument("--color_intersectionpoints", type=Color, default='4239343359', help="Color closed contours")
         self.arg_parser.add_argument("--dotsize", type=int, default=10, help="Dot size (px) for self-intersecting points")
         self.arg_parser.add_argument("--remove_opened", type=inkex.Boolean, default=False, help="Remove opened contours")
         self.arg_parser.add_argument("--remove_closed", type=inkex.Boolean, default=False, help="Remove closed contours")
diff --git a/extensions/fablabchemnitz_girdle.py b/extensions/fablabchemnitz_girdle.py
index 02cad45f..0952fd77 100644
--- a/extensions/fablabchemnitz_girdle.py
+++ b/extensions/fablabchemnitz_girdle.py
@@ -1,5 +1,4 @@
-#! /usr/bin/env python
-# coding=utf-8
+#! /usr/bin/env python3
 #
 # Este script dibuja el perfil exterior de corte la caja en un solo 
 # path cerrado y añade despues los otros flejes necesarios con colores
diff --git a/extensions/fablabchemnitz_linearcase.py b/extensions/fablabchemnitz_linearcase.py
index 69c17066..80357db4 100644
--- a/extensions/fablabchemnitz_linearcase.py
+++ b/extensions/fablabchemnitz_linearcase.py
@@ -1,5 +1,4 @@
-#! /usr/bin/env python
-# coding=utf-8
+#! /usr/bin/env python3
 #
 # 
 # Este script dibuja el perfil exterior de corte la caja en un solo 
diff --git a/extensions/fablabchemnitz_swissbottomcase.py b/extensions/fablabchemnitz_swissbottomcase.py
index c76a3121..6f35e54c 100644
--- a/extensions/fablabchemnitz_swissbottomcase.py
+++ b/extensions/fablabchemnitz_swissbottomcase.py
@@ -1,5 +1,4 @@
-#! /usr/bin/env python
-# coding=utf-8
+#! /usr/bin/env python3
 #
 # Este script dibuja el perfil exterior de corte la caja en un solo 
 # path cerrado y añade despues los otros flejes necesarios con colores